Search for right-handed currents in the decay chain of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi mathvariant="italic">K</mml:mi></mml:mrow><mml:mrow><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:mrow></mml:math>→<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi mathvariant="normal">μ</mml:mi></mml:mrow><mml:mrow><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:mrow></mml:math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mo>ν</mml:mo></mml:mrow><mml:mrow><mml:mi mathvariant="normal">μ</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math>,<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi mathvariant="normal">μ</mml:mi></mml:mrow><mml:mrow><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:mrow></mml:math>→<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi mathvariant="italic">e</mml:mi></mml:mrow><mml:mrow><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:mrow></mml:math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mo>ν</mml:mo></mml:mrow><mml:mrow><mml:mi mathvariant="italic">e</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math>ν<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">¯</mml:mi></mml:mrow><mml:mrow><mml:mi mathvariant="normal">μ</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math>
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説明
The asymmetry of positrons in the ${\mathit{K}}^{+}$\ensuremath{\rightarrow}${\mathrm{\ensuremath{\mu}}}^{+}$\ensuremath{\nu}, ${\mathrm{\ensuremath{\mu}}}^{+}$\ensuremath{\rightarrow}${\mathit{e}}^{+}$${\ensuremath{\nu}}_{\mathit{e}}$\ensuremath{\nu}${\mathrm{\ifmmode\bar\else\textasciimacron\fi{}}}_{\mathrm{\ensuremath{\mu}}}$ decay chain was measured in a search for right-handed weak currents in \ensuremath{\Delta}S=1 semileptonic decay. High-intensity low-background monoenergetic polarized muons of 236 MeV/c momentum resulting from kaon decay at rest were directly extracted from a primary production target which was hit by a proton beam of the KEK 12-GeV proton synchrotron. Muons were stopped in a pure-aluminum plate, and the energy-integrated asymmetry of the decay positrons with respect to the incoming muon direction was determined to high precision. The observed asymmetry yielded \ensuremath{\xi}${\mathit{P}}_{\mathrm{\ensuremath{\mu}}}$=-0.9996\ifmmode\pm\else\textpm\fi{}0.0030(stat)\ifmmode\pm\else\textpm\fi{}0.0048(syst). This result revealed no evidence of right-handed currents in this kaon-decay chain, and set a stringent bound on the mass of the right-handed weak boson.
収録刊行物
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- Physical Review D
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Physical Review D 50 69-91, 1994-07-01
American Physical Society (APS)